Water-tube boiler.



J. MIYABARA. WATER TUBE BOILER. APPLICATION FILED DBO.14, 1909.

Patented 0C1; 25,1910. I

4 SHEETS-SHEET 1.

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WITNESSES.-

ATTOR EY.-

J. MIYABARA. WATER TUBE BOILER. APPLICATION FILED DEO.14, 1909.

Patented Oct. 25, 1910.

4 SHEETS-SHEET 2.

INVENTQR.

.A rTogzw;

MINESSES: $25

J. MIYABARA.

WATER TUBE BOILER. APPLIOATION FILED D3014, 1909.

Patented 0011.25, 1910.

4 SHEETS-8HBET 3.

. r/ 7 .r//I!//////////I/ INVENTOR.

ATTORNE J. MIYABARA. WATER TUBE BOILER... APPLICATION FILED 1920.14, 1909.

Patented Oct. 25, 1910.

4 SHEETS-SHEET 4.

JW NT WITNESSES A TTORNE Y.

U E ES 1 ATENT oFFioFL.

Jmo iYAB'A'RA, or TOKYO, JAPAN.

WATER-TUBE BOILER.

To. al'Lwhomit may concern:

Be it known that I, Jnio MlY.-\BAR.--\, a subjectof the Emperor of Japan, and a resident of Tokyo, Japan, have invented a. new S and useful Improvement in W ater-l:"ube (Boilers, of which the following, is a specification" My invention comprises several improvements in construction and operation, of "which some are applicable to boilers in genera-l, while others are applicable 'mrticularly to boilers of the type disclosed in my Letters Patent of Great Britain, dated April 30th, 1896, No. 91-31.

a boiler, having. provision for producing, superheated steam, with means whereby the "Pmductsot combustion 1.3 which the superheating means are'normally heated may be diverted from said meaiis when, for any ='reason, the steam consumption is interrupted or greatly reduced, in) .order that overheating of the super-heating means may be avoided. A Y T "Another obj'ectof the invention is to pro- (111cc a uater tub'e boilerjwl'iich may be readily arranged to produce either superheated steam or saturated steam, and which may he .convertcd at will from one mode of opera- 80 :t-ion to the other.

I A third object of the invention is to pro- "vide a boiler with means for diminishing the influx of air when the fire door is opened, .for'the purpose of stinking the boiler.

' Otherohjeets of the invention, andthe -:;-means by whicl i the several objects are carried fout, Will he noted iu" o(-mnection wit-h a-the' description of the illustrated einbo'di- I -ment of theinvention.

.flwo preferred embodimen ts'orf the-inentionfare illustrated gin theacconipanying drawings, in which:

gFi "re 1 15a longitudinal sectional View certaintfeatures of the invention. Fig; 2 is ia transverse rsectional'view, on liiie :ir'r Iilig. -3, of a locomotive boiler embodying certain features of the invention; Fig. 3 is a section on, linefg i in. Fig. 2, looking from right to -left.- -Fig. 4 is a detail view, in sec tji.on'al elevation, showing the device's for separating. steam and water in the water walls of the boiler; Fig. fiisa sectio n,lon line-'2z in 'Fig; 4, looking from left to r-i ht.

' o the superheating drums. Fig. 7 is a Specification or Letters Patent. I

Application filed December 14, 1909.

' vertical tubes.

One object of my invention is to provide.

act as uptakes for water and steam; order to maintain the circulation through of. ao'iler of the'stationarytypg embodying Fig. 6 is a transverse section of one Serial No. 533,011"

tion of the air curtain in connection with an inwardlyopening fire door.

The boiler illustrated in Fig. 1 has. front and rear water walls, each wullcon i 'n'isiug a number of drums connected by rows of The front wall coniprises drums, 1, 3 and 5, connected by vertical tubes 10, and'the back wall comprises drums 2, 4. and G, similarly connected' 'Il1e c oin.

bustion space 9. of the boil e1- 'is cro; ed by inclined water tubes 11, which eonn'v drum with the one next above on theopposite wall. The water walls constitute downtakes -t'or the water while the water tubes In these parts, thedrurns-3'and ,4 are provided withdiaphragms 13-, which separate the 1scending currents from the descending currents. These diaphragnis, together with the inner portions of thedrums 3 and 4:, constitute means for coupling the oppositely inclined water tubes which terminate at the drums 3 and 4t.

When the boiler is used m rddimt; superheated steam the drums 5 and 6 constitute the uppermost drums of. the water walls',-

and these drums also constitute steam drums, as the wate1' .is.main.ta ined at the. level indicated at 14in the drawing; The steam is superheated in tubes 15, which are m nected with th'edriuns 5 and 6, and which cross the combustion spacein the same main nor as the-water tubes. The supenh'ea'ting tubes :15 ternnn'ate 1n two drums," 7 and 8,

which are arranged, respectively. above the front and rear. waterqwallsp vFrom..thes'e drums the steam isdrawnofi" for use.

Toseparate the steam from the water in the drums 5 and 6, the. ends Of' the superheating tubeslti are coveredjby separator boxes 17. These boxes-areshoyvn in; detail in Figs, t. and 5, and; they are perforated intheir upper portions to admit the, steam,

while their lower portions are made imperforate to exclude the-water. The separator boxes rest, at their lower extremities, :upon flanges 21 riveted upon the inner-surfaces of t e drums, and they are fiurthersecured Fig. 9 is-a front view of.

-When the boiler is used for from the l'owerdrums into t may constitute parts of the water walls. 'These means comprise vertical tubes 40 simi-' lar to the tubes 10 hereinbefore described.

reducing superheated steam, the upper en s of the tubes 40 are closed by mushroom valves 31, so as to' prevent the direct passagp of the steam e .s'uperheating drums, but when .the boiler is used to produce saturated steam, the valves 31 are 0 ned and the water level is raised to -fil1 t e tubes 40 and to 'artly fi'll the drums 7 and sand the super eating tubes 15. The valves 31 are simultaneously. operated, in each ofthe drums 7 and 8, bymeans of a rock shait 33 which turns in la 34 on the inside of each drum. The roc shaft car-' ris short arms 32 toeach of whichone of the valves is loosel connected. The rock shaft is actuated y means of a rod 36 which 'is ivotedto an arm on the rock shaft- T e rod 36 slides through a stuflin box 41 at the top of the drum, and is move by any convenient means,-to operate the valves. When the valves 31 are opened, the tubes act as water down-takes in the same manner as the tubes 10,. .and the tubes 15 act as water-tubes, in the same manner as .the tubes 13,-and thedrums 7. and'8 act as collectors of saturated'steam. When, on the other hand, the valves 31 are closed and the water level is lowered, the saturated steam, which collects in; the drums 5 and 6, passes above the water level, through the tubes 15' and collects in the drums 7 and 8 in super- These fi heated condition. v The a plication of the invention to a locomotive oiler isillustrated in Figs. 2 and 3.

es show also the device fendi- Ffirerting t e products ofc in'nbustion from the 5.0 I stop ing o;.the

superheating tubes when-the consumption of steamis interrupted temporarily, as by theocomotiye'; 5 To this end the a corn ustlgir'pa'ce divided bya transverse .-wall'26,' which normally serves as a bafile,

cf the Well, then over the top of the wall, and thence downwardl causing the roducts of. combustion to pass first upward yamong the tubes in the rear among the tubes in frontof the wall-- At t e bottom of the wall is an opening normall closedby a.pivoted door or valve 23, whic is covered with suit- The door 23 is actuate ach ' boiler.

,of the wall 28.

however, by means of anarm- 24 1 and a rod 25, and when it is opened b these means, a direc passage is opened or the products of co bustion, which emits them to pass to the front of the we assing over the wall and between the superiieating tubes. Two other baflie walls, 27 and 28 are provided in the front portion of the No superheatin tubes are located between these walls, an it is therefore unnecessary to provide a passage at the bottom When the fire door of a boiler is opened for the purpose of feedin or dressing the fire a considerable indraft 0 air ordinarily takes place, andthis cold air, mingling directly withthe products of combustion, checks the generation of steam as long as the door is open. To reduce the flow of air through the doorway, I have provided-my improved boile'r with a device in the forni of a curtain consisting. of heavy ropes or chains 38 of incombustible material, such as asbestos, these ropes or chains, as shown in Figs. 8 and 9, being suspended in the doorway, and hanging close together. The interstices between the ropes or chains are suflicient to permitinspection of the fire, and the curtain yields readily when coal or .stoking implements are introduced, but the curtaintserves to reduce to a considerable extent the flow of air through the opening. Where an inwardly-opening door is used, as shown in Fig. 10, the curtain is fastened to the outside of the 'door, so as to assume the; position shown in dotted lines when the door ened. ertain features of my invention, such as the fire-door curtain, are applicable to boilers of various types in addition tothe articular type of water-tube boiler, whic I have illustrated and described.

Various modifications ma be made in the ISO 26 without.

illustrated embodiment o the invention,

within the; nature and scope of the invention, as it is defined in the following claim;

. I claim:

A water-tube boiler having,.in combination, two water walls on op' osite'sides of the 'combustipn space of the'boi er inclined water tubes connecting the water walls, a super heated steam chamber located above each water wall, inclined superheatin tubesconnecting each water wall with t e opposite superheated-steam chamber, and steam separators located at the lower ends of the superheating tubes to prevent the entrance of water. I

In witness whereof, I have hereunto. set my hand this ninth day of November, 1909. J I O MIYAB-ARA. -In the presence of- GENJI Kummna, 'MASATARO OKASAVBA. 

